Nanotechnology Now

Our NanoNews Digest Sponsors
Heifer International

Wikipedia Affiliate Button

Home > Press > RMIT researchers make leap in measuring quantum states

The unknown quantum state is shown as a red dot on the Bloch sphere. The algorithm estimates the gradient performing measurements with the green and purple projectors, updates the current estimate of the state (red line), and repeats until the desired accuracy is achieved.
CREDIT: RMIT University
The unknown quantum state is shown as a red dot on the Bloch sphere. The algorithm estimates the gradient performing measurements with the green and purple projectors, updates the current estimate of the state (red line), and repeats until the desired accuracy is achieved.

CREDIT: RMIT University

Abstract:
A breakthrough into the full characterisation of quantum states has been published today as a prestigious Editors' Suggestion in the journal Physical Review Letters.

RMIT researchers make leap in measuring quantum states

Melbourne, Australia | Posted on July 21st, 2016

The full characterisation (tomography) of quantum states is a necessity for future quantum computing. However, standard techniques are inadequate for the large quantum bit-strings necessary in full scale quantum computers.

A research team from the Quantum Photonics Laboratory at RMIT University and EQuS at the University of Sydney has demonstrated a new technique for quantum tomography -- self-guided quantum tomography -- which opens future pathways for characterisation of large quantum states and provides robustness against inevitable system noise.

Dr Alberto Peruzzo, Director of the Quantum Photonics Laboratory, said: "This is a big step forward in quantum tomography. Our technique can be applied to all quantum computing architectures in laboratories around the world."

"Characterising quantum states is a serious bottleneck in quantum information science. Self-guided quantum tomography uses a search algorithm to iteratively 'find' the quantum state.

"This technique significantly reduces the necessary resources by removing the need for any data storage or post-processing."

Robert Chapman, lead author and RMIT PhD student, said the technique employed was far more robust against inevitable noise and experimental errors than standard techniques.

"We experimentally characterise quantum states encoded in single photons -- single particles of light.

"Photons are a strong candidate for future quantum computing, however, our method can be applied to other quantum computing architectures, such as ion traps and superconducting qubits.

"Any experiment suffers from measurement noise which degrades results. In our experiment, we engineer the level of noise up to extreme levels to test the performance of our algorithm. We show that self-guided quantum tomography is significantly more robust against noise than standard tomography.

"We hope research groups can employ our technique as a tool for characterising large quantum states and benefit future quantum technologies."

####

For more information, please click here

Contacts:
Dr Alberto Peruzzo

61-410-790-860

Copyright © RMIT University

If you have a comment, please Contact us.

Issuers of news releases, not 7th Wave, Inc. or Nanotechnology Now, are solely responsible for the accuracy of the content.

Bookmark:
Delicious Digg Newsvine Google Yahoo Reddit Magnoliacom Furl Facebook

Related Links

The research, "Experimental demonstration of self-guided quantum tomography", has been published in Physical Review Letters and can be accessed online:

Follow the Quantum Photonics Lab at:

Related News Press

News and information

Moving diagnostics out of the lab and into your hand: Electrochemical sensor platform technology could enable portable, multiplexed, point-of-care diagnostics for a wide range of applications November 11th, 2019

Arrowhead Pharmaceuticals to Webcast Fiscal 2019 Year End Results November 11th, 2019

Scientists probe the limits of ice: Transition between ice and liquid water gets fuzzy at the nanoscale November 9th, 2019

Arrowhead and Collaborator Janssen Present Phase 2 Clinical Data for Investigational Hepatitis B Regimens at The Liver Meeting® 2019 November 8th, 2019

Go with the flow: Scientists design new grid batteries for renewable energy: New blueprint for affordable, sustainable 'flow batteries' developed at Berkeley Lab could accelerate an electrical grid powered by the sun and wind November 8th, 2019

Quantum Physics

A distinct spin on atomic transport: Work that demonstrates simultaneous control over transport and spin properties of cold atoms establishes a framework for exploring concepts of spintronics and solid-state physics November 8th, 2019

Structured light promises path to faster, more secure communications: Quantum mechanics is embracing patterns of light to create an alphabet that can be leveraged to build a light-based quantum network November 6th, 2019

Superconductivity

Thorium superconductivity: Scientists discover a new high-temperature superconductor November 8th, 2019

Quantum Computing

A distinct spin on atomic transport: Work that demonstrates simultaneous control over transport and spin properties of cold atoms establishes a framework for exploring concepts of spintronics and solid-state physics November 8th, 2019

Thorium superconductivity: Scientists discover a new high-temperature superconductor November 8th, 2019

Scientists tame Josephson vortices November 1st, 2019

Small magnets reveal big secrets: Work by international research team could have wide-ranging impact on information technology applications October 28th, 2019

Discoveries

Moving diagnostics out of the lab and into your hand: Electrochemical sensor platform technology could enable portable, multiplexed, point-of-care diagnostics for a wide range of applications November 11th, 2019

Scientists probe the limits of ice: Transition between ice and liquid water gets fuzzy at the nanoscale November 9th, 2019

Thorium superconductivity: Scientists discover a new high-temperature superconductor November 8th, 2019

Self-assembled microspheres of silica to cool surfaces without energy consumption November 8th, 2019

Announcements

Moving diagnostics out of the lab and into your hand: Electrochemical sensor platform technology could enable portable, multiplexed, point-of-care diagnostics for a wide range of applications November 11th, 2019

Arrowhead Pharmaceuticals to Webcast Fiscal 2019 Year End Results November 11th, 2019

Scientists probe the limits of ice: Transition between ice and liquid water gets fuzzy at the nanoscale November 9th, 2019

A distinct spin on atomic transport: Work that demonstrates simultaneous control over transport and spin properties of cold atoms establishes a framework for exploring concepts of spintronics and solid-state physics November 8th, 2019

Interviews/Book Reviews/Essays/Reports/Podcasts/Journals/White papers/Posters

Moving diagnostics out of the lab and into your hand: Electrochemical sensor platform technology could enable portable, multiplexed, point-of-care diagnostics for a wide range of applications November 11th, 2019

Scientists probe the limits of ice: Transition between ice and liquid water gets fuzzy at the nanoscale November 9th, 2019

Self-assembled microspheres of silica to cool surfaces without energy consumption November 8th, 2019

Arrowhead and Collaborator Janssen Present Phase 2 Clinical Data for Investigational Hepatitis B Regimens at The Liver Meeting® 2019 November 8th, 2019

Photonics/Optics/Lasers

Researchers synthesize 'impossible' superconductor October 3rd, 2019

Trapping and moving tiny particles using light September 24th, 2019

Tiny, biocompatible laser could function inside living tissues: Nanolaser has potential to treat neurological disorders or sense disease biomarkers September 23rd, 2019

Nano bulb lights novel path: Rice University engineers create tunable, nanoscale, incandescent light source September 20th, 2019

NanoNews-Digest
The latest news from around the world, FREE



  Premium Products
NanoNews-Custom
Only the news you want to read!
 Learn More
NanoStrategies
Full-service, expert consulting
 Learn More











ASP
Nanotechnology Now Featured Books




NNN

The Hunger Project